package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;
    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();

        for (LocalDate date : dateList){
            LocalDateTime beginDB = LocalDateTime.of(date , LocalTime.MIN);
            LocalDateTime endDB = LocalDateTime.of(date ,LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin" ,beginDB);
            map.put("end" ,endDB);
            map.put("status" , Orders.COMPLETED);

            Double turnover = orderMapper.sumBYMap(map);
            turnover = turnover == null?0.0:turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList ,","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        //统计日期
        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id) from orders where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList){
            LocalDateTime localDateTime1 = LocalDateTime.of(date ,LocalTime.MIN);
            LocalDateTime localDateTime2 = LocalDateTime.of(date ,LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end" ,localDateTime2);

            Integer totalUser = userMapper.countByMap(map);

            map.put("begin" ,localDateTime1);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }


        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList ,","))
                .newUserList(StringUtils.join(newUserList ,","))
                .totalUserList(StringUtils.join(totalUserList ,","))
                .build();
    }


    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //统计每日有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        //统计每日订单数
        List<Integer> orderCountList = new ArrayList<>();


        for (LocalDate Date : dateList){
            LocalDateTime localDateTime1 = LocalDateTime.of(Date ,LocalTime.MIN);
            LocalDateTime localDateTime2 = LocalDateTime.of(Date ,LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin" ,localDateTime1);
            map.put("end" ,localDateTime2);

            //统计每日总订单
            Integer ord1 = orderMapper.countByMap(map);

            //统计每日有效订单数
            map.put("status" ,5);
            Integer ord2 = orderMapper.countByMap(map);

            orderCountList.add(ord1);
            validOrderCountList.add(ord2);
        }

        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        orderCompletionRate = totalOrderCount != 0 ? validOrderCount.doubleValue() / totalOrderCount : 0;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList ,","))
                .orderCountList(StringUtils.join(orderCountList ,","))
                .validOrderCountList(StringUtils.join(validOrderCountList ,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量排名前十
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        //起始时间
        LocalDateTime beginTime = LocalDateTime.of(begin ,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end ,LocalTime.MAX);

        //统计商品名称和销量以GoodsSalesDTO返回
        List<GoodsSalesDTO> salesDTOList = orderMapper.getSalesTop10(beginTime ,endTime);

        List<String> names = salesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names ,",");

        List<Integer> numbers = salesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers ,",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }
}
